McGrath, AK 99675 Frost Dates
Frost dates for McGrath, AK, ZIP 99675
Typically, the last spring freeze lands around 05/13, roughly 258 days out. The first fall frost typically arrives around 09/13, about 120 frost-free days later.
The USDA Plant Hardiness Zone Map puts McGrath in Zone 2a (-50 to -45°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 2a around McGrath has about 2 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
How much risk comes with planting early here
05/13 is the middle of 30 years of NOAA records, not a promise. Plant by 05/04 and you're betting against frost in roughly 9 years out of 10. 05/28 is the safer bet, historically only a 1-in-10 chance of frost that late.
How McGrath compares
At roughly 120 frost-free days, McGrath places 39,103 of 40,283 ZIP codes in this dataset. Within AK, it ranks 133 of 269.
Learn more
zone vs. frost date explains why Zone 2a and McGrath's frost date answer different questions, and the frost range explains how to read the range around McGrath's dates instead of trusting one.